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How to add fields dynamically in a Sencha Architect Project?

I am presently working on a Sencha Touch project for which I am using Sencha Architect 2. It is a rule builder sheet which sets the authorization level for various permissions. Depending on the authorization limit, I am showing the following screen as an overlayscreenshot.jpg

For this screen, I have taken static fields (i.e I have assumed that there will be only 4 fields namely Create, Read, Update, Delete) but I want the fields to be loaded dynamically using a JSON file. The format of my Json file is as follows:

The problem that arises now is that I cannot load data from a store for a FieldSet. If I use a List instead of FieldSet, these checkboxes won't appear. I think modifying the templates will help but I am not very comfortable with it.